Adding tools menu responsiveness metric.

ios/shared/chrome/browser/ui/tools_menu/tools_menu_configuration.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/shared/chrome/browser/ui/tools_menu/tools_menu_configuration.h"
 
 #import "base/ios/weak_nsobject.h"
 #import "base/logging.h"
 #include "ios/web/public/user_agent.h"
 
 @implementation ToolsMenuConfiguration {
   base::WeakNSObject<UIView> _displayView;
   base::WeakNSObject<UIButton> _toolsMenuButton;
   base::WeakNSObject<ReadingListMenuNotifier> _readingListMenuNotifier;
 }
 
 @synthesize inTabSwitcher = _inTabSwitcher;
 @synthesize noOpenedTabs = _noOpenedTabs;
 @synthesize inIncognito = _inIncognito;
 @synthesize userAgentType = _userAgentType;
+@synthesize requestStartTime = _requestStartTime;
 
 - (instancetype)initWithDisplayView:(UIView*)displayView {
   if (self = [super init]) {
     _userAgentType = web::UserAgentType::NONE;
     _displayView.reset(displayView);
     _readingListMenuNotifier.reset();
   }
   return self;
 }
 
@@ skipping 31 matching lines @@
 - (void)setReadingListMenuNotifier:
     (ReadingListMenuNotifier*)readingListMenuNotifier {
   _readingListMenuNotifier.reset(readingListMenuNotifier);
 }
 
 - (ReadingListMenuNotifier*)readingListMenuNotifier {
   return _readingListMenuNotifier;
 }
 
 @end